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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This is indeed a bug. I get a different error on my machine. Until we solve this bug, as a workaround, you can use the <4 x float> type for which the vselect works. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu] <b>On Behalf Of </b>Fan Dawei<br><b>Sent:</b> Wednesday, October 19, 2011 10:10<br><b>To:</b> LLVMdev@cs.uiuc.edu<br><b>Subject:</b> [LLVMdev] Error when cond of select instruction is a vector<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi LLVMdev,<br><br>In the specification of llvm ir, the select operation can takes a condition of vector type,<o:p></o:p></p><h4><a name="i_select">'</a><tt><span style='font-size:10.0pt'>select</span></tt>' Instruction <o:p></o:p></h4><h5>Syntax:<o:p></o:p></h5><pre> <result> = select <i>selty</i> <cond>, <ty> <val1>, <ty> <val2> <i>; yields ty</i><o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <i>selty</i> is either i1 or {<N x i1>}<o:p></o:p></pre><h5>Overview:<o:p></o:p></h5><p>The '<tt><span style='font-size:10.0pt'>select</span></tt>' instruction is used to choose one value based on a condition, without branching.<o:p></o:p></p><p class=MsoNormal><br>If the condition is a vector of i1, then the value arguments must be vectors of the same size, and the selection is done element by element. <br><br>However when I create a program use vector of il as the type of condition. The back-end fails and complains:<br><br><i>SplitVectorOperand Op #0: 0x2b75370: f32 = select 0x2b6c800, 0x2b75270, 0x2b75170 [ID=0]<br><br>Do not know how to split this operator's operand!</i><br><br>The following program is a valid IR which passed by the checker. However the back-end fails on all the targets I've tested, including x86, mips and sparc. Is it a target independent bug?<br><br><span style='font-family:"Courier New"'> define void @main() {<br>entry:<br> %Cy300 = alloca <4 x float><br> %Cy11a = alloca <2 x float><br> %Cy118 = alloca <2 x float><br> %Cy119 = alloca <2 x float><br> br label %B1<br><br>B1: ; preds = %entry<br> %0 = load <2 x float>* %Cy119<br> %1 = fptosi <2 x float> %0 to <2 x i32><br> %2 = sitofp <2 x i32> %1 to <2 x float><br> %3 = fcmp ogt <2 x float> %0, zeroinitializer<br> %4 = fadd <2 x float> %2, <float 1.000000e+00, float 1.000000e+00><br> %5 = select <2 x i1> %3, <2 x float> %4, <2 x float> %2<br> %6 = fcmp oeq <2 x float> %2, %0<br> %7 = select <2 x i1> %6, <2 x float> %0, <2 x float> %5<br> store <2 x float> %7, <2 x float>* %Cy118<br> %8 = load <2 x float>* %Cy118<br> store <2 x float> %8, <2 x float>* %Cy11a<br> ret void</span><br>}<br><br><br>Thanks,<br>David<o:p></o:p></p></div><font face="monospace">---------------------------------------------------------------------<br>
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